Amazon.com: WorkDone 4-Pack - 2.5" Hard Drive Caddy - Compatible for Dell PowerEdge Servers - 14th Gen R440 R640 R740 R740xd R840 R940 R6415 R650xs - Bright LED SSD SAS SATA NVMe
Dell EMC PowerEdge R740 and R740xd Technical Guide
Amazon.com: 2.5" DXD9H SSD SAS SATA NVMe Hard Drive Caddy for 14th Gen R440 R640 R740 R740xd R940 R6415 R7415 R7425 Dell PowerEdge Servers Hot Swap Bracket : Electronics